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Finding the Fourth Proportional to 288.63, 398.34 and 172.19

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Solution

The fourth proportional to 288.63, 398.34 and 172.19 is: 237.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.63 : 398.34 = 172.19 : x
  2. Step 2: Convert to fraction form
    288.63/398.34 = 172.19/x
  3. Step 3: Cross multiply
    288.63x = 398.34 × 172.19
  4. Step 4: Simplify right side
    288.63x = 68,590.16
  5. Step 5: Solve for x
    x = 68,590.16/288.63
  6. Step 6: Final answer
    x = 237.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.